TQ2440在linux下控制AD实验总结OK

1、TQ2440在linux下控制 AD实验总结myadc.c：#include #include Vinux/delay .h#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include vola

2、tile unsigned long *adccon = NULL; /adc 控制寄存器volatile unsigned long *adctsc = NULL; /adc触摸屏控制寄存器volatile unsigned long *adcdly = NULL; /adc起始延迟寄存器volatile unsigned long *adcdatO = NULL; /adc转换数据寄存器volatile unsigned long *adcdat1 = NULL; /adc转换数据寄存器volatile unsigned long *intmsk = NULL;#define MYADC_

3、MAJOR 150/*预设的 globalmem 的主设备号 */static int myadc_major = MYADC_MAJOR; struct cdev* adc_cdev;ssize_t drive_read(struct file *file, char *buf, size_t count, loff_t *f_ops)int val;printk(drive read okn);*adccon |= (1 14) | (0xff 6) | (2 ops = &drive_ops;cdev_init (&adc_cdev, &drive_ops);cdev_add(&adc_

4、cdev, dev, 1);adccon = (volatile unsigned long *)ioremap(0x58000000, 16); adctsc = (volatile unsigned long *)ioremap(0x58000004, 8); adcdly = (volatile unsigned long *)ioremap(0x58000008, 16); adcdat0 = (volatile unsigned long *)ioremap(0x5800000c, 16); adcdat1 = (volatile unsigned long *)ioremap(0x

5、58000010, 16); intmsk = (volatile unsigned long *)ioremap(0x4a000008, 32); printk(drive button init okn);return 0;static void _exit exit_drive(void)dev_t dev;dev = MKDEV(myadc_major, 0);cdev_del(&adc_cdev);unregister_chrdev_region(dev, 1);printk(drive button exit okn);module_init(init_drive); module

6、_exit(exit_drive);MODULE LICENSE(GPL);Makefile :ifneq ($(KERNELRELEASE),)obj-m :=myadc.oelseKERNELDIR ?= /home/book/opt/EmbedSky/linux-2.6.30.4/PWD := $(shell pwd)default:$(MAKE) -C $(KERNELDIR) M=$(PWD) modulesclean:rm -rf *.o * core .depend .*cmd *ko *mod.cendiftest.c：#include #include #include #i

7、nclude #include int main(int argc, char *argv)int fd, ret;int val;fd = open(/dev/myadc, O_RDWR);if(fd = -1)printf(cant open device mknod %s c zhu ci n, /dev/myadc); return 0;whileread(fd，&val,sizeof(val);printf(appn);printf(val=%dn,val);sleep(3);ret = close(fd);if (ret = -1)printf(app close error!n);return 0;return 0;实验现象：拨动可调电阻改变电压，发现数值会随之发生变化。rootEmbedSky /# insmod myadc.kodrive button init okrootEmbedSky /# ls -l /dev/myadccrw-rw-1 root root10, 55 Feb 24 11:38 /dev/myadcrootEmbedSky /# cat /proc/devicesCharacter devices:7 vcs10 misc13 inputrootEmbedSky/# ./testdrive read okdrive val=5